diff --git a/drivers/net/ethernet/rdc/r6040.c b/drivers/net/ethernet/rdc/r6040.c
index 7c74318620b1d82bf7596d65ba174a674d06ef1c..aff68e2cb700885ccf5bd763336ab164f1994d8c 100644
--- a/drivers/net/ethernet/rdc/r6040.c
+++ b/drivers/net/ethernet/rdc/r6040.c
@@ -200,7 +200,7 @@ static int r6040_phy_read(void __iomem *ioaddr, int phy_addr, int reg)
 	int limit = MAC_DEF_TIMEOUT;
 	u16 cmd;
 
-	iowrite16(MDIO_READ + reg + (phy_addr << 8), ioaddr + MMDIO);
+	iowrite16(MDIO_READ | reg | (phy_addr << 8), ioaddr + MMDIO);
 	/* Wait for the read bit to be cleared */
 	while (limit--) {
 		cmd = ioread16(ioaddr + MMDIO);
@@ -224,7 +224,7 @@ static int r6040_phy_write(void __iomem *ioaddr,
 
 	iowrite16(val, ioaddr + MMWD);
 	/* Write the command to the MDIO bus */
-	iowrite16(MDIO_WRITE + reg + (phy_addr << 8), ioaddr + MMDIO);
+	iowrite16(MDIO_WRITE | reg | (phy_addr << 8), ioaddr + MMDIO);
 	/* Wait for the write bit to be cleared */
 	while (limit--) {
 		cmd = ioread16(ioaddr + MMDIO);